Puff of smoke on start up and kill

PTmowerMech

Lawn Addict
Briggs 17.5 31C707 0603 B2.

On start up and when I kill it, I get a little puff of white smoke. It smokes a little more when I start it up. But it doesn't smoke for more than a few seconds. I'm pretty sure the valves need to be adjusted because I get a little bit of a stall when it's turning over.
 
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